* core: enhance storage type validation and error codes
Improve storage validation for LXC container creation with
explicit checks for unsupported storage types.
Changes:
- Add validation for storage types that don't support containers:
- iscsidirect (exit 212) - VMs only
- iscsi/zfs (exit 213) - no rootdir support
- cephfs (exit 219) - use RBD instead
- pbs (exit 224) - backups only
- Add connectivity check for network storage (linstor, rbd, nfs, cifs)
- Simplify storage content validation using pvesm status
- Reorganize Proxmox error codes (200-231) for consistency
- Update error messages to be more descriptive and actionable
This helps users identify storage compatibility issues early
before container creation fails with cryptic errors.
* Update build.func
0f7c201b57